Thermostat.



J. F. McELHOY, DECD.

s. H. McELROY, EXECUTRIX.

THERMOSTAT.

APPLICATION FILED 0CT.21 i911. F 1

Patented Dec. 12, 1916.

llllL l I D INVENTOR WITNESSES: XTJJKM.

. UNITED STATES PATENT OFFICE.

TAKES F. MOELROY, OF ALBANY, NEW YORK; SUSIE H. MCELROY, EXEGUTRIX OFS AID JAMES F. MCELROY, DECEASED, ASSIGNOR TO CONSOLIDATED CAR-HIE]A'J.Il'.1 1'G COM- IPANY, A CORPORATION OF WEST VIRGINIA. V

THERMOSTAT.

Specification of Letters Patent.

Patented Dec. 12, 1916.

Application filed October 21, 1911. Serial No. 655,847.

' present deem preferable.

For a detailed description of the present form of my invention, reference may be had to the following specification and to the accompanying drawing, which illustrates my invention.

Figure 1 is a plan view; Fig. 2 is a ver tic-a1 longitudinal section; Fig. 3 is a detail section on line A-B, Figs. 1 and 2. Fig. 1 is a detail section on line (3-1), Figs. land 2. V

My invention rel-ates to'a thermostat so constructed as to be immune or neutral to abnormal vibrations in either a vertical or horizontal direction, such vibration tending heretofore to seriously interfere with the I pin being mounted in a standard C.

proper action of thermostatically controlled mechanism on railway cars or in other situations where the thermostat is subjected to jarring or shocks.

Referring to the drawing K is the contact arm of the thermostat formed of magneticmaterial such as iron or steel. The forward end lies in a vertical and the rear end in a horizontal plane, the arm being given a: twist near its center for this purpose. Just at the left of the twist in the arm a brass ofl'set S is riveted thereto which has a horizontal flange on both its upper and lower edges, as appears in the section. thereof in Fi 3. Through these flanges is passed the vertical pivot rod D (see Fig 3) giving the arm a long bearing vertically, the 1pivot oreover the arm projects equally, as to its weight, on both sides of thebearing and is consequently balanced- "on the bearing against vertical vibrations which would tend to bind the bearing or causeincidental oscillations of the arm and also against horizontal shocks which act equally on both ends of the arm. In other words the arm is. mounted approximately at its center of gravity.

E and E are two composite bars or strips which respond, by bending, to changes in temperature and together constitute a ther-' against abnormal vibrations by jarring mostatic element. They are U-shaped and secured at their respective inner ends to the uprights of a yoke-shaped standard F (see Figs. 1 and 4) while their outer ends are turned inward and rest against, loosely without being attached to, the aforesaid offset S of the arm K on opposite sides respectively of the pivotal bearing. They are also symmetrically placed with respect to the upper and lower bearing points on the pivot-rod D and act differentially on arm K and thereby cooperate to turn it on its pivot. The offset S has a short projection t (see Figs. 1 and 3) which extends downwardly and outwardly and has attached thereto one end of a spring G, the other end of which is anchored to one end of an adjustment-yoke R resting on the base of the instrument and controlled by an ad justing screw P. This arrangement of the strips E and E with respect to the arm K serves to free the latter from the effect of horizontal jar and vibration of the strips, since they both, cooperating by pressure on the arm K in opposite directions, tend to exert a turning movement on the arm against the opposite turning movement of the spring G. Hence any shock tending to force strip E, for instance, against the olfset, and cause it to increase its pressure against spring G, is counterbalanced by the effect of the same shock in causing the other strip E to move in the same direction and thereby decrease its pressure against spring G. The practical result is that both the arm K and strips E E are neutralizeril an shock and my compensated thermostat can therefore be used effectively in railway cars and other situations where the ordinary uncompensated thermostat would be constantly causing false contacts, and consequent untimely action of the apparatuswhich the thermostat controls, such false contacts being due to shocks and vibrations of a non-thermal character and not to changes in temperature.

On each side of the arm K is a magnet, the two-magnets being shown at A and A.

' Each magnet has its two poles adjacent to the arm, so that, when energized, it may attract and hold the arm in the position to which the arm has moved to cause the e w ergizing of the magnet. The left hand pole of eachmagnet is formed by a loop of magnetic materiai (see it and it) both sides of the loop being traversed" by a contact screw (see 0 andQ) and serving to lock the screw in any position at which it may be set. The electric current enters by the wire l/V, which is attached to the yoke lF, and passes thence, by the base-plate H and standard C, to the arm K. When the arm K comes in contact with screw O for instance,

the current then flows by the core of the magnet and wire N to the winding of the magnet, thence by magnet wire Q to the con nection-plate T and the outgoing wire X. When, on the other hand, the arm K comes in contact with screw Q, there will be a similar current-route established through magnet A to outgoing wire Y. The outgoing wires X and Y lead to the apparatus to be controlled by the thermostat where difiterent efiects are to be produced according to the temperature changes afiecting the thermostat The apparatus above described is' mounted on a base Z and inclosed in a casing V, composed partly of glass V:

What T claim as new and desire to secure by Letters Patent is:

1. The combination with stationary contacts and a movable contact piece, of a thermostatic element engaging the movable contact piece to move the same conformable i to temperature changes, and non-thermostatic means independent of the stationary contacts cooperating with the thermostatic element to prevent non-thermal vibrations of said movable contact piece.

2. The combination with stationary contacts and a neutrally mounted contact piece, of a thermostatic element engaging the movable contact piece to move the same conformable to temperature changes, and adjustable non-thermostatic means independent of the stationary contacts cooperating with the thermostatic element to prevent non-thermal vibration of said movable contact piece.

3. In a thermostat, the combination with a movable contact-piece neutrally mounted with respect to non-thermal vibrations, of

.a thermostatic element acting thereon neutrally with respect to non-thermal vibrations, and adjustable means acting on the contact piece in opposition to the thermostatic element. A g I 4t. In a thermostat, the combination with a movable contact-piece pivotally mounted at its center of gravity, ofa'thermost'atic element actingth ereonm response totemperature variations, and adjustable means engaging and acting'on the contact piece in opposition to the thermostatic element.

5. In a thermostat, the combination with a movable'cont'act-piece pivotallv mounted t emes-r piece on opposite sides of its pivotal point. i

7; In a thermostat, the combination with a movable contact-piece extending horizontally and pivotally mounted at its center of gravity of a horizontal thermostatic element acting difi'erentially thereon on opposite sides of its pivotal point and a spring acting in opposition to said element.

8. Tn a thermostat, a movable arm mounted at its center of gravity, a thermostatic element having its opposite ends applied difierentially to the said arm on opposite sides of its pivotal point, and a spring acting in opposition tothe said element.

9. In a theremostat, a pivoted arm mounted neutrally with respect to non-thermal vibrations, a thermostatic element having its opposite ends bearing loosely against said arm on opposite sides of its pivotal- 1 point respectively and a spring acting in opposition to said element.

10. In a thermostat, a movable arm, an ofi'set thereon, a pivot-pin applied to said ofi set and on which said movable arm is mounted neutrally with respect to nonthermal vibrations,'a thermostatic element bearing against said oilset on opposite sides of the pivotal point, and a spring acting in v opposition to said element. v

11. A thermostat comprising a contact bar pivotallysupported at its center of gravity, thermostatic elements disposed onopposite sides of the. contact bar and bearing against the contact bar on opposite sides of its piv- In witness whereof I have hereunto set my hand, before two subscribing Witnesses, this 16th day of October, 1911.

, JAMEsr. McELROY. Witnesses J. A. MoEnvENEY, E. H. VIBBARD. 

